D63GS NEC, D63GS Datasheet - Page 16

• Manufacturer Part Number: D63GS
• Description: Search -----> UPD63GS
• Manufacturer: NEC

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3.2 K
3.2.1 K
5 of the P4 register.
3.2.2 S
in 2-bit units by means of bit 4 of the P4 register.
through current does not flow internally. In OFF mode, “1” can be read regardless of the pin state.
3.2.3 S
and OUTPUT mode.
S
transmission display pin (refer to 4. TIMER).
16
1
/LED ports in 2-bit units by means of bit 4 of the P4 register.
The K
The pin state can be read.
Software can be used to set the availability of the pull-down resistor of the K
When reset, the pull-down resistor is connected.
b
b
b
Caution In order to prevent malfunction, be sure to input a low level to more than one of pins K
The S
The pin state can be read by setting this port to INPUT mode with bit 0 of the P4 register.
In INPUT mode, software can be used to set the availability of the pull-down resistor of the S
If INPUT mode is canceled (thus set to OFF mode), the pin becomes high-impedance but it also makes that the
When reset, it is set to OFF mode, thus becoming high-impedance.
The S
It uses bit 2 of the P4 register to set INPUT or OUTPUT mode. The pin state can be read in both INPUT mode
When in INPUT mode, software can be used to set the availability of the pull-down resistor of the S
When in OUTPUT mode, the pull-down resistor is automatically disconnected thus becoming the remote control
When reset, it is placed in OUTPUT mode, and high level is output.
2
3
4
-b
7
I
I
0
1
Port/Special Ports (P1)
I
0
1
/LED (port bit 3 of P1)
port (P
/LED port is the input/output port.
: In INPUT mode, state of the S
: The state of the S
: The state of the K
port (P1’s bit 2)
port is to the 4-bit input port for key entry.
port is the INPUT/OFF mode port.
In OFF mode, this bit is fixed to “1”.
when reset is released (when RESET pin changes from low level to high level, or POC is released
due to supply voltage startup).
Bit
Name
11
: bits 4-7 of P1)
1
I
b
K
/LED pin is read regardless of INPUT/OUTPUT mode (Read only).
pin is read (Read only).
7
I3
Table 3-3. K
b
K
6
I2
0
pin is read (Read only).
b
K
I
5
I1
/Special Port Register (P1)
b
K
4
I0
b
S
3
1
/LED
b
S
2
0
I
port in 4-bit units by means of bit
b
(Fixed to “1”)
1
b
0
0
PD63, 63A, 64
and S
1
/LED port
I0
to K
0
and
I3